AE43: Rückentext skaliert, Titel 5,76 → 8,16 pt

scripts/build_kdp_cover_wrap.py

@@ -232,8 +232,12 @@ def draw_spine(width: int, height: int, art: Image.Image) -> Image.Image:
     # Rotated text: read bottom→top when book stands (common DE trade convention:
     # when flat front-up, spine text reads left-to-right from top of book — we use
     # rotate 90° CCW so title reads correctly on shelf for most EU paperbacks).
-    title_f = font(BASK, 4, max(14, min(24, width - 8)))
-    author_f = font(AVEN, 5, max(11, min(16, width - 10)))
+    # Title size sets the block: author size and both offsets follow it, so the
+    # 2 px gap between title and author ink holds at larger sizes (AE-43).
+    title_px = max(14, min(34, width - 8))
+    author_px = max(11, round(0.6 * title_px))
+    title_f = font(BASK, 4, title_px)
+    author_f = font(AVEN, 5, author_px)
 
     # Build horizontal text image then rotate
     text_h = max(height - inches(0.6), 100)
@@ -247,11 +251,11 @@ def draw_spine(width: int, height: int, art: Image.Image) -> Image.Image:
     tw = td.textlength(title, font=title_f)
     aw = td.textlength(author, font=author_f)
     y_mid = (text_canvas_h - 20) // 2
-    td.text(((text_canvas_w - tw) / 2, max(0, y_mid - 12)), title, font=title_f, fill=(238, 242, 248, 245))
+    td.text(((text_canvas_w - tw) / 2, max(0, y_mid - round(0.5 * title_px))), title, font=title_f, fill=(238, 242, 248, 245))
     # Author only if spine is wide enough
     if width >= inches(0.45):
         td.text(
-            ((text_canvas_w - aw) / 2, min(text_canvas_h - 18, y_mid + 14)),
+            ((text_canvas_w - aw) / 2, min(text_canvas_h - 18, y_mid + round(0.6 * title_px))),
             author,
             font=author_f,
             fill=(180, 196, 214, 230),